In a previous post here I detailed the Scale Up and Scale Out capabilities of VSAN. It looks like I’ll need to redo my diagrams since Virtual SAN just increased the number of HDDs in a disk group from 6 to 7. That’s a 17% increase in RAW capacity. The number of SSD’s remain 1 per disk group, 5 per host, 40 per 8 host cluster. With the increase from 6 to 7 HDD’s per disk group you can now have 35 HDD’s per host and in an 8 host cluster an increase from 240 to 280 HDD’s. That’s an extra 40 HDD’s which translates to a ton of extra RAW capacity.
To support this increase you’ll need to download the recently released VSAN Beta code found on the VMware Virtual SAN Community page.
Also check out this great post on Virtual SAN – Sizing Considerations.